How to conduct live-dead-live testing

Conducting a live-dead-live testing is easier with a Proving Unit on hand. A Proving Unit generates a known voltage source, so that you can verify the functionality of your test tools before connecting to the panel.

Live-dead-live (aka: “three-point testing” or “LDL”) is the process of

On conductors or circuits operating at 50 V or more, NFPA 70E requires visual inspection of test instruments and test leads for apparent damage before you begin a job. You must then verify your meter is working properly before going into the test area.

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